These are chat archives for pixijs/pixi.js
not in sync with the actual dimensions Pixi is rendering
That's the catch, Containers are not rendered. They have no dimensions because we don't draw them :) Sprites are drawn though.
As far as extension vs ownership, it is up to you. Both have advantages and disadvantages, just whatever works best for you.
someContainer.addChild(myLayer.sprite). Totally up to you and your app structure